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dinkar's avatar
dinkar
New Contributor
2 years ago

Need all the columns pipeline using expression in mapper snap.

when we use $.keys() below image which is showing list of columns for all the records which leads to performance issue (for example we have 1 lakh records, it will check for all 1 lakh records) ... Need only first row columns... Please help with expression which gives all columns for only 1 record.

 

3 Replies

  • SpiroTaleski's avatar
    SpiroTaleski
    Valued Contributor
    2 years ago

    dinkar 

    Instead of going for all the rows, using the Head snap you will be able to get only first row and then get all the columns using keys() function.

  • dinkar's avatar
    dinkar
    New Contributor
    2 years ago

    I need to know columns present in input pipeline

  • SpiroTaleski's avatar
    SpiroTaleski
    Valued Contributor
    2 years ago

    dinkar 

    Check the Head Snap, you will be able to limit to a first row from the input stream, and then to get columns from that first row using the same function($.keys())